Quote:
Originally Posted by freebeard
On turbojets the serrations are used to order the vorticity and suppress noise.
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On the jet engine, the dynamic flow is the bypass from the fan interfacing with slower, higher pressure air outside, and then the actual jet thrust interfacing with the slower, higher pressure fan thrust outside, 'backwards' from the box-cavity/ trailer tail which is 'dead' inside.
To reduce drag on the truck, one wants to use every millimeter of length at the tail for pressure recovery and uniform velocity/pressure when the streams meet, minimizing shear.